问题标题：
10.Abouthowmanyelements____makeupmostofthesubstanceswemeetineverydaylife?Abouthowmanyelements____makeupmostofthesubstanceswemeetineverydaylife?A.itisthatB.itiswhichC.isitthatD.isitwhich用which,还是用that是怎
问题描述：
10.Abouthowmanyelements____makeupmostofthesubstanceswemeetineverydaylife?
Abouthowmanyelements____makeupmostofthesubstanceswemeetineverydaylife?
A.itisthat
B.itiswhich
C.isitthat
D.isitwhich
用which,还是用that是怎么看的?
用itis,还是用isit是怎么看的?
胡家耀回答：
我们每天需要的大部分物质大约有多少种元素组成?主句Abouthowmanyelementsisit所以用isit从句thatmakeupmostofthesubstanceswemeetineverydaylifeit在主句做的是形式主语,故需以that引导的同位...
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